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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2025
Related Party Transaction [Line Items]  
Allowance For Funds Used During Construction / Capitalized Interest
AES Ohio capitalizes an allowance for the net cost of funds (interest on borrowed funds and a reasonable rate of return on equity funds) used for construction purposes during the period of construction with a corresponding credit to income. During the three months ended March 31, 2025 and 2024, AFUDC equity and AFUDC debt were as follows:
Three months ended
March 31,
$ in millions20252024
AFUDC equity$— $1.8 
AFUDC debt$1.4 $2.1 
Schedule of Accumulated Other Comprehensive Income (Loss)
The changes in the components of AOCL during the three months ended March 31, 2025 are as follows:
$ in millionsChange in cash flow hedgesChange in unfunded pension and other postretirement obligationsTotal
Balance as of January 1, 2025$10.4 $(15.7)$(5.3)
Amounts reclassified from AOCL to earnings(0.2)0.2 — 
Net current period other comprehensive income / (loss)(0.2)0.2 — 
Balance as of March 31, 2025$10.2 $(15.5)$(5.3)
Schedule of Supplemental Financial Information
The following table summarizes accounts receivable as of March 31, 2025 and December 31, 2024:
$ in millionsMarch 31, 2025December 31, 2024
Accounts receivable, net:
Customer receivables$102.9 $79.8 
Unbilled revenue26.3 24.1 
Amounts due from affiliates 3.0 3.0 
Other7.3 6.0 
Allowance for credit losses(8.1)(6.1)
Total accounts receivable, net$131.4 $106.8 
Accounts Receivable, Allowance for Credit Loss
The following table is a roll forward of our allowance for credit losses related to the accounts receivable balances for the three months ended March 31, 2025 and 2024:
Three months ended
March 31,
$ in millions20252024
Allowance for credit losses:
Beginning balance$6.1 $0.9 
Current period provision1.8 0.8 
Write-offs charged against allowance(0.1)(1.0)
Recoveries and account write-ons0.3 0.2 
Ending balance$8.1 $0.9 
New Accounting Pronouncements, Policy [Policy Text Block]
New Accounting Pronouncements Issued But Not Yet Effective
The following table provides a brief description of recent accounting pronouncements that could have an impact on our consolidated financial statements. Accounting pronouncements not listed below were assessed and determined to be either not applicable or are expected to have no material impact on our consolidated financial statements.
Schedule of Cash and Cash Equivalents [Table Text Block]
The following table summarizes cash, cash equivalents, and restricted cash amounts reported on the Condensed Consolidated Balance Sheets that reconcile to the total of such amounts as shown on the Condensed Consolidated Statements of Cash Flows:
$ in millionsMarch 31, 2025December 31, 2024
Cash and cash equivalents$81.2 $54.0 
Restricted cash (included in Prepayments and other current assets)
0.1 0.1 
Total cash, cash equivalents and restricted cash$81.3 $54.1 
Schedule of New Accounting Pronouncements
New Accounting Pronouncements Issued But Not Yet Effective
The following table provides a brief description of recent accounting pronouncements that could have an impact on our consolidated financial statements. Accounting pronouncements not listed below were assessed and determined to be either not applicable or are expected to have no material impact on our consolidated financial statements.
Subsidiaries [Member]  
Related Party Transaction [Line Items]  
Allowance For Funds Used During Construction / Capitalized Interest
AFUDC
AES Ohio capitalizes an allowance for the net cost of funds (interest on borrowed funds and a reasonable rate of return on equity funds) used for construction purposes during the period of construction with a corresponding credit to income. During the three months ended March 31, 2025 and 2024, AFUDC equity and AFUDC debt were as follows:
Three months ended
March 31,
$ in millions20252024
AFUDC equity$— $1.8 
AFUDC debt$1.4 $2.1 
Schedule of Accumulated Other Comprehensive Income (Loss)
The changes in the components of AOCL during the three months ended March 31, 2025 are as follows:
$ in millionsChange in Accumulated other comprehensive loss
Balance as of January 1, 2025$(26.4)
Amounts reclassified from AOCL to earnings0.5 
Balance as of March 31, 2025$(25.9)
Schedule of Supplemental Financial Information
The following table summarizes accounts receivable as of March 31, 2025 and December 31, 2024:
$ in millionsMarch 31, 2025December 31, 2024
Accounts receivable, net:
Customer receivables$101.7 $79.0 
Unbilled revenue26.3 24.1 
Amounts due from affiliates 3.9 3.6 
Other7.4 6.0 
Allowance for credit losses(8.1)(6.1)
Total accounts receivable, net$131.2 $106.6 
Accounts Receivable, Allowance for Credit Loss
The following table is a roll forward of our allowance for credit losses related to the accounts receivable balances for the three months ended March 31, 2025 and 2024:
Three months ended
March 31,
$ in millions20252024
Allowance for credit losses:
Beginning balance$6.1 $0.9 
Current period provision1.8 0.8 
Write-offs charged against allowance(0.1)(1.0)
Recoveries and account write-ons0.3 0.2 
Ending balance$8.1 $0.9 
New Accounting Pronouncements, Policy [Policy Text Block]
New Accounting Pronouncements Issued But Not Yet Effective
The following table provides a brief description of recent accounting pronouncements that could have an impact on our financial statements. Accounting pronouncements not listed below were assessed and determined to be either not applicable or are expected to have no material impact on our consolidated financial statements.

ASU Number and NameDescriptionDate of AdoptionEffect on the financial statements upon adoption
2023-09 Income Taxes (Topic 740): Improvements to Income Tax DisclosuresThe amendments in this Update require that public business entities on an annual basis (1) disclose specific categories in the rate reconciliation and (2) provide additional information for reconciling items that meet a quantitative threshold. Furthermore, companies are required to disclose a disaggregated amount of income taxes paid at a federal, state, and foreign level as well as a break down of income taxes paid in a jurisdiction that comprises 5% of a company's total income taxes paid. Lastly, this ASU requires that companies disclose income (loss) from continuing operations before income tax at a domestic and foreign level and that companies disclose income tax expense from continuing operations on a federal, state, and foreign level.The amendments in this Update are effective for fiscal years beginning after December 15, 2024.We are currently evaluating the impact of adopting the standard on our financial statements. This ASU only affects disclosures, which will be provided when the amendment becomes affected.
2024-03: Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40)
The amendments in this Update require disclosure, in the notes to financial statements, of specified information about certain costs and expenses. The amendments require that at each interim and annual reporting period an entity:

1. Disclose the amounts of (a) purchases of inventory, (b) employee compensation, (c) depreciation, (d) intangible asset amortization, and (e) depreciation, depletion, and amortization recognized as part of oil- and gas-producing activities (DD&A) (or other amounts of depletion expense) included in each relevant expense caption. A relevant expense caption is an expense caption presented on the face of the income statement within continuing operations that contains any of the expense categories listed in (a)–(e).

2. Include certain amounts that are already required to be disclosed under current generally accepted accounting principles (GAAP) in the same disclosure as the other disaggregation requirements.

3. Disclose a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively.

4. Disclose the total amount of selling expenses and, in annual reporting periods, an entity’s definition of selling expenses.
The date for each amendment in this Update is effective for fiscal years beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted.We are currently evaluating the impact of adopting the standard on our financial statements. This ASU only affects disclosures, which will be provided when the amendment becomes affected.
Schedule of Cash and Cash Equivalents [Table Text Block]
The following table summarizes cash, cash equivalents, and restricted cash amounts reported on the Condensed Balance Sheets that reconcile to the total of such amounts as shown on the Condensed Statements of Cash Flows:
$ in millionsMarch 31, 2025December 31, 2024
Cash and cash equivalents$60.4 $24.6 
Restricted cash (included in Prepayments and other current assets)
0.1 0.1 
Total cash, cash equivalents and restricted cash$60.5 $24.7